Log Message:
zsh-autosuggestions: update to 0.4.3.

## v0.4.3
- Avoid bell when accepting suggestions with `autosuggest-accept` (#228)
- Don't fetch suggestions after [up,down]-line-or-beginning-search (#227, #241)
- We are now running CI against new 5.5.1 version
- Fix partial-accept in vi mode (#188)
- Fix suggestion disappearing on fast movement after switching to `vicmd` mode (#290)
- Fix issue rotating through kill ring with `yank-pop` (#301)
- Fix issue creating new pty for async mode when previous pty is not properly \ 
cleaned up (#249)